Detail of restored roof; Link to Parknet
STANDARDS FOR RESTORATION AND GUIDELINES FOR RESTORING HISTORIC BUILDINGS
detail photo of historic building with awnings

Although the work in the following sections is quite often an important aspect of restoration projects, it is usually not part of the overall process of preserving features from the restoration period (protection, stabilization, conservation, repair, and replacement); rather, such work is assessed for its potential negative impact on the building's historic appearance. For this reason, particular care must be taken not to obscure, alter, or damage features from the restoration period in the process of undertaking work to meet code and energy requirements.

Masonry/Wood/Architectural Metals

Recommend
Installing thermal insulation in attics and in unheated cellars and crawlspaces to increase the efficiency of the existing mechanical systems.

Installing insulating material on the inside of masonry walls to increase energy efficiency where there is no interior molding around the windows or other interior architectural detailing from the restoration period.

Not Recommended
Applying thermal insulation with a high moisture content in wall cavities which may damage historic fabric.

Installing wall insulation without considering its effect on interior or other architectural detailing.

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Windows

Recommend
Utilizing the inherent energy conserving features of a building by maintaining windows and louvered blinds from the restoration period in good operable condition for natural ventilation.

photo of 19th century church window with operable shutters





The operable shutters on this 19th century church window provide an acceptable level of energy efficiency for the historic building. Photo: HABS Collection, NPS.

Improving thermal efficiency with weatherstripping, storm windows, caulking, interior shades, and if historically appropriate, blinds and awnings.

Installing interior storm windows with air-tight gaskets, ventilating holes, and/or removable clips to ensure proper maintenance and to avoid condensation damage to historic windows.

Installing exterior storm windows which do not damage or obscure the windows and frames.

Not Recommended
Using shading devices that are inappropriate to the restoration period.

Replacing multi-paned sash from the restoration period with new thermal sash utilizing false muntins.

Installing interior storm windows that allow moisture to accumulate and damage the window.

Installing new exterior storm windows which are inappropriate in size or color.

Replacing windows or transoms from the restoration period with fixed thermal glazing or permitting windows and transoms to remain inoperable rather than utilizing them for their energy conserving potential.

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Entrances and Porches

Recommend
Maintaining porches and double vestibule entrances from the restoration period so that they can retain heat or block the sun and provide natural ventilation.

photo showing how prominent porch can moderate the effects of a hot climate



On both front and side elevations, this prominent porch helps moderate the effects of the hot, southern climate. Photo: HABS Collection, NPS.

Not Recommended
Changing porches significant to the restoration period by enclosing them.

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Interior Features

Recommend
Retaining interior shutters and transoms from the restoration period for their inherent energy conserving features.

Not Recommended
Removing interior features from the restoration period which play a secondary energy conserving role.

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Mechanical Systems

Recommend
Improving energy efficiency of existing mechanical systems by installing insulation in attics and basements.

Not Recommended
Replacing existing mechanical systems that could be repaired for continued use.

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Building Site

Recommend
Retaining plant materials, trees, and landscape features which perform passive solar energy functions such as sun shading and wind breaks, if appropriate to the restoration period.

Not Recommended
Removing plant materials, trees, and landscape features from the restoration period that perform passive solar energy functions.

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Setting (District/Neighborhood)

Recommend
Maintaining those existing landscape features which moderate the effects of the climate on the setting such as deciduous trees, evergreen wind-blocks, and lakes or ponds, if appropriate to the restoration period.

Not Recommended
Stripping the setting of landscape features and landforms from the restoration period so that effects of the wind, rain, and sun result in accelerated deterioration of the historic building.

 

-GUIDELINES-

The Approach

Exterior Materials
Masonry
Wood
Architectural Metals

Exterior Features
Roofs
Windows
Entrances + Porches
Storefronts

Interior Features
Structural System Spaces/Features/Finishes
Mechanical Systems

Site

Setting

Special Requirements
Energy Efficiency
Accessibility
Health + Safety

The Standards

 

  HISTORICAL OVERVIEW - PRESERVING - REHABILITATING - restoring- RECONSTRUCTING

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Historical Overview